<template>
  <ul class="todo-main" @mouseleave="mouseIndex=-1">
    <li 
    v-for="todo,index in todoList" 
    :key="todo.id"
    @mouseenter="mouseIndex=index"
    :class="{active:mouseIndex===index}"
    >
      <label>
        <input
          type="checkbox"
          :checked="todo.done"
          @click="emit('inputCheck',index)"
         />
        <span>{{ todo.thing }}</span>
      </label>
      <button 
      class="btn btn-danger"
      @click="emit('deleteItem',index)"
      >
        删除
      </button>
    </li>
  </ul>
</template>

<script lang="ts">
 import { defineComponent } from 'vue'
  export default  defineComponent({
    name:'Content'
  })
</script>
<script lang="ts" setup>
import {todoListType} from "../../App"
import { ref } from 'vue'
const props = defineProps<{
    //限制类型并确定接收的props
    todoList:todoListType
}>()
//初始化一个鼠标移动值
const  mouseIndex = ref(-1)

//接受自定义事件
const emit = defineEmits<{
    (event:"deleteItem",index:number):void
    (event:"inputCheck",index:number):void
}>()
</script>

<style lang="scss" scoped>
  /*main*/
.todo-main {
  margin-left: 0px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 0px;
}

.todo-empty {
  height: 40px;
  line-height: 40px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding-left: 5px;
  margin-top: 10px;
}
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
.active {
  background-color: #ccc;
  button {
    display: block;
  }
}
.active{
    background-color: #ccc;
    button{
        display: block;
    }
}
</style>